Hi!
I'm not sure if this really is a question for APR or httpd, but since
I started digging into this from the httpd end first I'll start by
asking here what to make of this.
Linux/Ubuntu 14.04LTS, httpd-2.4.20, APR as shipped in
httpd-2.4.20-deps (1.5.2 AIUI).
I stumbled along the define APR_HAS_XTHREAD_FILES, and the more I
poked arount the more confused I got. Are the flags
APR_HAS_XTHREAD_FILES and APR_FOPEN_XTHREAD intended to be used in
httpd as well? I suspect they are, since the apr-util file buckets
might not really work as intended otherwise...
I can't find any clear docco on the intended use, but comments in
apr-util/buckets/apr_buckets_file.c can be interpreted to mean that
when APR_HAS_XTHREAD_FILES is true then fd:s can be shared across
threads.
AFAIK, this is true for all Unix platforms, but APR_HAS_XTHREAD_FILES
is false on my build.
Within httpd, APR_XTHREAD (the old name for APR_FOPEN_XTHREAD) only
seems to be set in modules/arch/win32/mod_isapi.c and
modules/cache/mod_file_cache.c.
My understanding is that the apr/apr-util code only acts if
APR_FOPEN_XTHREAD is set, and since that's not the case in most places
of httpd the XTHREAD code is mostly never triggered.
To be honest, I would have expected at least some XTHREAD presence in
the event mpm, but perhaps it's assumed that the configure tests
catches this?
In any case, I suspect that APR_HAS_XTHREAD_FILES really should be set
to true on Unix builds. However, I'm guessing that this is purely an
APR bug in that case?
/Nikke - confused now?
--
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Niklas Edmundsson, Admin @ {acc,hpc2n}.umu.se | [email protected]
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